* Implement a very simple prefetching solution.
* Remove next-prefetcher.
* Require 'whatwg-fetch' only in the client.
* Use xhr in the code.
* Use a simple fetching solution.
* Fix 404 and xhr status issue.
* Move the prefetching implementation to next/router.
* Add deprecated warnning for next/prefetch
* Run only 2 parellel prefetching request at a time.
* Change xhr to jsonPageRes.
* Improve the prefetching logic.
* Add unit tests covering the Router.prefetch()
* Update examples to use the new syntax.
* Update docs.
* Use execOnce() to manage warn printing.
* Remove prefetcher building from the flyfile.js
Because, we no longer use it.
* Write BUILD_ID when building.
It's a random id (uuid.v4())
* Add buildId to the core JS files.
* Add immutable cache-control header.
Only if the buildId is matched.
* Set '-' as the dev buildId always.
* Add buildId handling for JSON pages.
* Register the service worker.
* Update prefetcher code to do prefetching.
* Implement the core prefetching API.
support "import <Link>, { prefetch } from 'next/prefetch'"
* Implement a better communication system with the service worker.
* Add a separate example for prefetching
* Fix some typos.
* Initiate service worker support even prefetching is not used.
This is pretty important since initiating will reset the cache.
If we don't do this, it's possible to have old cached resources
after the user decided to remove all of the prefetching logic.
In this case, even the page didn't prefetch it'll use the
previously cached pages. That because of there might be a already running
service worker.
* Use url module to get pathname.
* Move prefetcher code to the client from pages
Now we also do a webpack build for the prefetcher code.
* Add prefetching docs to the README.md
* Fix some typo.
* Register service worker only if asked to prefetch
We also clean the cache always, even we initialize
the service worker or not.
